“Yes, and no.
The data come directly from the engines, powered by the engines. There would be no reason to run a switch to the cockpit, as that would increase the chance of a short, not decrease it.”
The data from the engines is also available to the pilots for them to monitor engine performance. The engine data is then sent via the ACARS system which performs other data transmission activities.
Completely different circuits.
Data feed and power are not the same, even on the simplest devices.